Heat exchanger for cooling circulating water of fuel cells & process for producing same

摘要

The invention relates to a heat exchanger for cooling a circulating water of a fuel cell. This heat exchanger includes (1) an aluminum member having an inner surface which defines an inner space in the aluminum member such that the circulating water is allowed to flow through the inner space; and (2) a resin coating layer formed on the inner surface of the aluminum member. It becomes possible to prevent contamination of the circulating water by the provision of the resin coating layer. The heat exchanger can be produced by a first process including (a) providing a core portion having tubes made of aluminum and corrugated fins, which are alternately arranged; (b) assembling the core portion and a tank made of aluminum into an assembly; (c) brazing the assembly by heating into a brazed assembly; and (d) coating the inner surface of the brazed assembly with a resin coating layer.